skeleton
• bone development and extent of ossification is markedly reduced when prospective bone-forming regions (parts of the lower jaw or central portion of the limbs of E12.5-13.5 embryos) are transplanted under the kidney capsule of adult wild-type hosts or onto chorioallantoic membrane of 8 day chick embryos
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• bone formation is initiated in two embryos that survive to E16, however bone development is retarded and does not progress to later stages of endochondrial ossification
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